Green beer is a type of beer that is colored green, typically achieved by adding food coloring or using specific ingredients like green tea or spirulina. It is most commonly associated with celebrations such as St. Patrick's Day, where it is enjoyed as a festive drink to honor Irish culture. The practice of drinking green beer began in the United States in the early 20th century and has since become a popular tradition. While it is often served in bars and restaurants during March, some breweries also produce limited-edition green beers for the occasion, making it a fun and unique experience for beer enthusiasts.